Telstra $10 plan clearance

Product Name: Telstra $10 plan clearance
Cheap Mobile Plans with International Callings for Students in Australia clearance, Is this even legal? Telstra automatically upgrading me to a more expensive plan without asking. Currently paying $39 month-to-month ($10 monthly discount at signup) for 15gb. : r/AusFinance clearance, Telstra $10 SIM card TRI CUT SIM | eBay clearance, Cheap Mobile Plans with International Callings for Students in Australia clearance, Pre-Paid Sim Cards for Vodafone, Optus ,Telstra - $10, $30, $40 and Data- Melb | eBay clearance.